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When an oxide of Mn (B). Compound (B) ...

When an oxide of Mn
(B). Compound (B) disproportionate in neutral or acidic solution to give purple compound

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`B : K_(2) MnO_(4)`
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When MnO_2 is fused with KOH in the presence of KNO_3 as an oxidising agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises KI to compound (C) whereas acidified solution of compound (B) oxidises KI to (D). Identify A, B, C and D.

When MnO_2 is fused with KOH in the presence of KNO_2 as an oxidising agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises KI to compound (C) whereas an acidified solution of compound (B) oxidises KI to (D). Identify (A), (B), (C), and (D).

When an oxide of manganese (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic (C ) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.

CBSE COMPLEMENTARY MATERIAL-The d- AND f-BLOCK ELEMENTS-SHORT ANSWER-II TYPE QUESTION
  1. Write any four differences between lanthanoids and actinoids. Lanth...

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  2. give reason for the following statement (a)separation of lanthanoid el...

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  3. (b) Transition metal exhibit higher enthalpies of atomization. Explain...

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  4. (c) Why do the transition metal have high enthalpy of hydration ?

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  5. (a) By using Hund’s rule derive the electronic configuration of Ce^(+3...

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  6. (b) Is lanthanum a f-block element ?

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  7. Account for the following : (a) Silver chloride dissolves in excess ...

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  8. Account for the following : (b) Cuprous chloride is diamagnetic whil...

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  9. Account for the following : In CrO(4)^(2-) ion , all the Cr-O bond...

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  10. The values in respect of electrodes of Cr, Mn and iron are : Cr^(+3...

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  11. Write any three properties of interstitial compounds.

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  12. Account for the following : (a) All Scandium salts are white.

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  13. Account for the following : (b) The Ist ionization energy of the 5d ...

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  14. Account for the following : (c) Ce^(+3) can be easily oxidized to Ce...

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  15. A green chromium compound (A) on fusion with alkali gives a yellow

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  16. A green chromium compound (B) which on acidification gives a orange c...

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  17. A green chromium compound (C). Identify A, B, C. Write equations for ...

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  18. When an oxide of Mn (A) is fused with KOH in the presence of an oxi...

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  19. When an oxide of Mn (B). Compound (B) disproportionate in neutral or...

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  20. When an oxide of Mn (C). Identify A, B, C.

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